The lighthouse in Gaidaros

This lighthouse has a sophisticated rotary mechanism
with 12 parabolic mirrors. This fact, combined with its height reaching 29.5
metres, gave a luminescence that was over 20 miles –this is why the folk
tradition wanted its shine to be distinguished up to Izmir!

The lighthouse on the islet Didimi (Gaidaros or
Grado), opposite the entrance to the port of Ermoupoli, is stone-made. It operated
in 1847, but its construction began in 1834 in designs by Bavarian architect Erlacher
who built the marble interior staircase as well. It was the first lighthouse in the Aegean with
rotating mechanism and it was funded by the state in the period of King Otto.
Along with the lighthouse of Spetses (1837) it belongs to a special type that
has the home of the lighthouse keeper in a ground floor building.